SEA-FISHERIES LABORATORY. 203 



nordenskioldii, species that are rare or altogether absent 

 in September gatherings. The genus Thalassiosira is 

 mainly a spring form, rarely present after May, and is 

 not represented in autumn in this year's results. 



104.— Station III, September 12. 



Depth in fathoms 



Catch in c.cm 10^ 11 



Asterionella bleakelevi 1,200 1,200 



Chaetoceros debile 1,000 3,000 



decipiens 7,500 8,000 



teres 20,000 60,000 



subtile 123,000 140,000 



Coscinodiscus concinnus ... 2,500 2,500 



Ditylimn brightwellii 2,500 2,500 



Eucampia zodiacus 3,750 4,000 



Melosira borreri 4,000 5,000 



Lauderia borealis 100,000 120,000 



Leptocylindrus sp 38,000 50,000 



Coscinodiscus radiatus 1,250 1,250 



Rhizosolenia semispina 13,000,000 16,000,000 



shrubsolei 15,000 20,000 



stolterfothii ... 25,000 30,000 



setigera 2,500 2,500 



alata- 140,000 150,000 



Ceratium furca 2,500 7,500 



„ fusus 15,000 17,000 



tripos 37,000 50,000 



Medusoid gonophores 2 7 



Calanus helgolandicus 5 11 



Pseudocalanus elongatus ... 40 60 



Centropages hamatus 8 20 



Acartia clausi 800 900 



Oithona similis 200 250 



Isias clavipes 8 | ? 5 



Parapontella brevicornis 1 I ^f i 1 



Paracalanus parvus 20 i --M 80 



Copepod nauplii 8,000 '£ r 9,000 



juv 3,000 ' 3,800 



Oikopleura sp 10 10 



Ascidian eggs 4,000 10,000 



The three seasonal conditions illustrated by Forms 10 

 (April), 66 and 71 (August), and 104 (September) are very 

 well marked, and a detailed examination of these series of 

 hauls is instructive. 



